It is used mainly in HEMT and HBT structures, but also for the fabrication of high efficiency solar cells used for space applications and, in combination with aluminium (AlGaInP alloy) to make high brightness LEDs with orange-red, orange, yellow, and green colors.
Some semiconductor devices such as EFluor Nanocrystal use InGaP as their core particle.
Ga0.5In0.5P is a solid solution of special importance, which is almost lattice matched to GaAs.
This allows, in combination with (AlxGa1−x)0.5In0.5, the growth of lattice matched quantum wells for red emitting semiconductor lasers, e.g., red emitting (650nm) RCLEDs or VCSELs for PMMA plastic optical fibers.
Recent years have shown GaInP/GaAs tandem solar cells with AM0 (sunlight incidence in space = 1.35 kW/m2) efficiencies in excess of 25%.